Rock Blasting / A Practical Treatise on the Means Employed in Blasting Rocks for Industrial Purposes

by George G. André

Fig. 15.

[Fig. 15] represents a blasting sledge used in South Wales. The stumps are octagonal in section, and spring from a square block in the centre. The panes or striking faces, however, are circular and flat. The length of the head is 8³⁄₄ inches, and that of the helve 27 inches, and the weight of the tool complete 7 lb.

Fig. 16.

[Fig. 16] represents a blasting sledge used in North Wales. The central block is an irregular octagon in section, formed by slightly chamfering the angles of a square section, and the stumps are chamfered down to form a regular octagon at the panes, which are flat. The length of the head is 7³⁄₄ inches, and that of the helve 22 inches, and the weight of the tool complete 6 lb. 7 oz.

Fig. 17.

The sledges used in the north of England have shorter heads, and are lighter than the foregoing. [Fig. 17] represents one of these blasting sledges. The head is nearly square in section at the centre, and the panes are flat. The length of the head is 5 inches, and that of the helve 24¹⁄₂ inches, and the weight of the sledge complete 4 lb. 14 oz.